is tvheadend best for IPTV?

[gkusiak]

or are there better options that are current, still under active development?

has the tvheadend-xbian package been optimized for xbian in any way?

I've been given a trial on a service and I'd like to be pointed at something that has a better chance than not of working from the start.
The service suggests PVR Simple Client, but I've tried it and it's been stuttery even at 720.

thanks anyone who might see this and reply -gk